Source of InheritanceDemo.java

Structures and functions

public class InheritanceDemo

  1: //InheritanceDemo.java
  2: 
  3: public class InheritanceDemo
  4: {
  5:     public static void main(String[] args) 
  6:     {
  7:         Student s = new Student();
  8:         s.writeOutput();
  9:         System.out.println();
 10: 
 11:         s.setName("Warren Peace");
 12:         s.setStudentNumber(1234);
 13:         s.writeOutput();
 14:         System.out.println();
 15: 
 16:         Person p = new Person();
 17:         p.writeOutput();
 18:         System.out.println();
 19: 
 20:         Person pp = new Student();
 21:         pp.writeOutput();
 22: 
 23:         Student pp = new Person();  //illegal  Why?
 24:     }
 25: }